the fbi wants to interview tamerlan tsarnaev's widow. so far that has not happened but agents have spoken to katherine russell's attorney. he says she knew nothing about her husband's alleged role in the boston bombings. katherine russell lives with her parents in rhode island, where cnn's chris lawrence is this morning. good morning, chris. what's the latest? >> yeah, john, basically investigators want from katherine russell, they want to know, "a," what she now about what her husband was doing. and, if he had any other affiliations besides his younger brother. let's take you to some new video that we shot just in the last hour. can you see katherine russell's attorney arriving here at the family's home. she comes out of the home, and they leave together, followed by federal authorities. we know investigators have been to this home several times over the past couple days but so far she is only speaking to them through her attorney. he does tell us that she does not know anything about her husband's activities. that she was working upwar